Cellulose formates and process of making same.



OTTO I BONHOEFFER, F EIhBERFELD, AND HUGO GUNTBUM; 0F VOHWINKEL, NEAR ELBERFELD, GERMANY, ASSIGNORS TO. FARBENFAJBRIKEN VORM. FRIEDR. BAYER & (20.; OF ELBERFELD, GERMANY,-A CORPORATION OF GERMANY.

' oEL UnosE 'FORMATES AND rnocnss or MAKING SAME.

messes. mo prowling.

' formntesy The process for. preparing these new compounds consists in use compound, es cellulose or oxycelulose with formic acid and sulfuryl chlorid or chlorosulfo-nic acid The process can be promoted hy the additrcating a cellutionof zinc chlorid.

In carrying out the new process practi cally we can proceed asiolloiv's, the parts being by Weight: 20 parts of cotton are introduced into a; mixture of 100 parts of formic acid. (95 per cent), parts Znbl and parts of sulfuryl chlorid 01 The mixture is well stirred and is allowed to stand. for 5-6 hours. The elem: thick solution thus obtained is then poured intowutei', by which means the new foi-myl cellu- 7 h Specification of letters Patent. Application filed October 27, 1910. Serial No. 589,449.

ecially cellulose, hydro-- treatin r cellulose with Patented Apr. 14, fl?) Mt.

lose being most probably a mixture of dift'crent formyl cellulose is separated. It is a whitish voluminous-muss soluble in formic 3.; acid, in'a solution of ZnCl and is distinguished from the formylcellul'ose compoundsof the old arts by being more ,soluble in pyridin. .On evaporating the solutions of the new forinyl celluloses i colorless and transiucicl flexible film remains.

We cleimza i 1. The process of'producing cellulose es tersoi fatty acids, which consists in trcating cellulose compounds with a reagent conmining the radial of a fatty acid in presence of a chlorin derivative of sulfuric acid, substantially as and for the purpose specified.

2. The process of producing the formic acid ester of cellulose, which consists in formic acid in presence o a chlorin rleriwitiveof sulfuric acid, fiz slastantially as and for the purpose speci- In testimony whereof we have hereunto set our hands in the presence of two SlllJ- scrilnng witnesses.

o'iTo BONI-IOEFFER. [13.5.] uuoo ouurnun. mg

Jl itnesses Clue. J. Wnioirr, Amuse Hnnunn. 

